---
title: "First line Infoblock description"
slug: "first-line-info-block"
updated: 2026-09-02T05:51:29Z
published: 2026-09-02T05:51:29Z
canonical: "docs-linescan.alliedvision.com/first-line-info-block"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs-linescan.alliedvision.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Read first line info block

## Decoding of the first line info block

| Pixel | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Line 0 | Marker | Serial number | Marker | Image count | Exposure time | Marker | Line time | Encoder clocks | Error code | Time stamp | Marker |

## Serial number

"Serial number" shows the serial number of the camera. The serial number consists of two parts. The first part is the type-specific part and equal for all cameras of the same type. This information can be used to check the camera type. The second part is the camera-specific serial number and different for each camera.

The first 2 digits represent the camera family (eg. 40231)

#### allPIXAevo | eg. 40231

| allPIXAevo - SN digit 3 e.g. 40231 | Camera type |
| --- | --- |
| 0 | allPIXAevo 1 |
| 1 | allPIXAevo 2 |

| allPIXAevo - SN digit 4 e.g. 40231 | Interface type |
| --- | --- |
| 0 | Dual10GigE |
| 1 | DualSingle10GigE |
| 2 | Single10GigE |
| 3 | 4x CxP12 |

| allPIXAevo - SN digit 4 e.g. 40231 | Sensor resolution |
| --- | --- |
| 0 | 15K |
| 1 | 10K |
| 3 | 8K |
| 9 | 16K |

#### allPIXAneo | e.g. 41136

| allPIXAneo - SN digit 4 e.g. 41136 | Camera type |
| --- | --- |
| 0 | mono |
| 1 | color - VIS |
| 3 | color - NIR |

| allPIXAneo - SN digit 4 e.g. 41136 | Interface type |
| --- | --- |
| 3 | 2x CxP12 |
| 4 | nBase-T |
| 5 | nBase-T without PoE |

| allPIXAneo - SN digit 4 e.g. 41136 | Sensor resolution |
| --- | --- |
| 2 | 2K |
| 4 | 4K |
| 6 | 6K |
| 8 | 8K |
| 9 | 16K |

### Structure

The serial number consists of two parts.

| SN first part | SN second part |
| --- | --- |
| Byte 3 | Byte 2 | Byte 1 | Byte 0 |
| Px1 | Px2 | Px3 | Px4 |

### Decoding

**The decoding of the serial number is:**

The first part of the serial number S1 = Px1 × 256 + Px2

The second part of the serial number S2 = Px3 × 256 + Px4

**Example**

S1 = 156 × 256 + 64 = 40000

S2 = 0 × 256 + 157 = 157

![svg-read first line-serial number_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20first%20line-serial%20number_03.svg)

Example: decoding of SN: 40000-00157

## Image count

"Image count" is a counter that increments by 1 for each new image. This information can be used to ensure that all images are processed/saved.

### Structure

| Image count |
| --- |
| Byte 1 | Byte 0 |
| Px6 | Px7 |

### Decoding

**The decoding of the image count is:**

Ic = Px6 × 256 + Px7

**Example**

Ic = 1 × 256 + 120 = 376

![svg-read first line-image count_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20first%20line-image%20count_03.svg)

Example: image count 376

## Exposure time

This information can be used to read out the exposure time in us of the image.

### Structure

| Exposure time clocks |
| --- |
| Byte 1 | Byte 0 |
| Px8 | Px9 |

### Decoding

**The decoding of the exposure time is:**

Et = (Px8 × 256 + Px9) / fa

fa (10k, 15k) = 50 Mhz

fa (8k) = 80 Mhz

**Example**

Et = (5 × 256 + 220) / 50 = 50 µs

![svg-read first line-exposure time_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20first%20line-exposure%20time_03.svg)

Example: Decoding of exposure time

## Line time

This information represents the line time of the line that contains the first line infoblock.

### Structure

| Line time clocks |
| --- |
| Byte 2 | Byte 1 | Byte 0 |
| Px11 | Px12 | Px13 |

### Decoding

**The decoding of the Line time is:**

Lt = (Px11 × 216 + Px12 × 28 + Px13) / 100

**Example**

Lt = (0 × 216 + 21 × 28 + 124) / 100 = 55 µs

![svg-read first line-line time_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20first%20line-line%20time_03.svg)

Example: Decoding of line time

## Encoder clocks

This information is a counter that counts the single encoder signals. For a 2-channel encoder, the counter also counts backward for inverse transport direction. This information can be used to reference the position of the image to the absolute position of the transport process. The counter starts at 0 at the camera start and can not be reset.

### Structure

| Encoder clocks |
| --- |
| Byte 3 | Byte 2 | Byte 1 | Byte 0 |
| Px14 | Px15 | Px16 | Px17 |

### Decoding

**The decoding of the encoder clocks is:**

Ec = Px14 × 232 + Px15 × 216 + Px16 × 28 + Px17

## Time stamp

This is a timestamp which starts at 0 at the camera start. The resolution is 250us, after ~18h there is a counter overflow, the timer starts at 0 again.

### Structure

| Time [s] | Time [¼ ms] |
| --- | --- |
| Byte 2 | Byte 1 | Byte 0 |
| Px19 | Px20 | Px21 |

### Decoding

**The decoding of the time stamp is:**

Ts = (Px19 × 216 + Px20 × 28 + Px21) / 4